Valve-gear for power-hammers.



J. HAMILTON.

VALVE GEAR FOR. POWER H'AMMBRS.

APPLIOATION mum 001'. 22, 1900.

Pate nted Nov. 1, 1910.

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ATTORNEYS II I ||||l|| llllulllll IIII.

WIT/V5885 J. HAMILTON.

v VALVE GEAR FOR POWER HAMMEBS. APPLICATION rum) 00122, 1909.

974,264.. Patented Nov. 1,1910.

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JAMES HAMILTON, OF NEW YORK, N. Y.

VALVE-GEAR FOR POWER-HAMMERS.

Specification of Letters Patent.

Patented Nov. 1, 1910.

Application filed October 22, 1909. Serial No. 523,987.

To all whom it may concern:

Be it known that I, JAMns HAMILTON, a citizen of the United States, and resident, of the borough of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in Valve-Gears for Power-Hammers, of which the following is a specification, reference being had therein to the accompanying drawings, in which Figure 1 is a side elevation of a hammer provided with my improved valve gear; Fig. 2 a horizontal sectional view on the line IIII of Fig. 1; and Fig. 3 a side elevation of the upper portion of the hammer illustrated in Fig. 1, the valve casing and valve being removed to show the ports in the valve seat.

The main object of the invention is to provide a simple form of valve gear for power hammers adapted to be operated by any fluid under pressure, preferably steam.

Another object of the invention is to provide a simple form of slide valve which will be automatically operated by the reciprocation of a hannner-carrying piston as illustrated in the drawings.

Referring to the various parts by numerals, 1 designates the upright guides for the hammer mechanism, said guides being formed with vertical guide ribs 2 on their inner faces. Arranged between the guides is a rigid open hammer frame consisting of the side bars 3, upper cross-bar 1 and the lower connecting ring 5. The side bars each consist of two parallel bars 3 between which lugs 4 of the upper connecting bar, and lugs 5 of the lower connecting ring are bolted, these lugs serving to space said bars a suitable distance from each other. Connected to the upper cross-bar is a ring 6 to which suitable means may be attached for lowering and elevating the hammer mecha nism. A steam cylinder 8 is secured between 'the side bars near the upper ends thereof,

said cylinder being provided with vertical side flanges 7 which are arranged to fit between the bars 3 and to be securely bolted thereto.

The steam cylinder 8 is formed with a slide valve seat 9 near its lower end. In this valve seat are formed two inlet ports 10 and 11 and two exhaust ports 12 and 13. The port 10 leads to the upper end of the cylinder, as indicated in Fig. 3; and the port 11 leads to the lower end thereof, as is also illustrated in that figure. A slide valve 14 is arranged within a valve chest 15 and is held to its seat by the steam pressure in the chest. This valve is formed with an inlet port 17 and with two exhaust ports 18. Connected to the valve is a valve rod 19 whose ends extend through the walls of the valve chest and are provided with operating cams 20 and 20.

WVithin the cylinder is arranged apiston 21 and connected to said piston is a downwardly extending piston rod 22, said rod carrying at its lower end the ram or hammer weight 23. This weight is formed with vertical ribs 24 which are adapted to fit and slide between the bars 3 of the side bars 3 of the hammer frame. To the under side of the ram or hammer weight is secured the hammer head 26 which is adapted to contact with the piles in the driving operation.

Secured to the upper side of the ram 23 is a pair of cams 27 and 27. The cam 27 is adapted to contact with the cam 20 on the valve-rod when the piston has nearly reached the limit of its downward move ment, said cam being so arranged that it will force the valve-rod inwardly and thereby bring the port 17 of the valve into register with the inlet port'll of the valve seat, thereby admitting steam to the lower end of the cylinder and below the piston. This inward movement of the valve also puts the inlet port 10 in communication with the exhaust port 13 through the valve exhaust port 18, permitting the piston to be raised in the cylinder, thereby lifting the hammer. When the piston nears the limit of its upward movement cam 27 will engage cam 20 on the valve rod and force the said valve inwardly, thereby bringing the valve port into register with the cylinder port 10 and placing cylinder port 11 in eonmninication with the exhaust 12. This will reverse the movement of the piston and give the hammer ils downward or driving stroke.

Ste-.un or other zwtuating fluid under pressure is admitted to the valve chest through pipe 28. v

The operation of the hammer is obvious from the foregoing, but may be briefly described as follows :With the parts in the position shown in Figs. 1 and 2, steam will flow from the valve chest through valve port 17 and cylinder port 11 into the cylinder below the piston, and steam will exhaust from the cylinder above the piston through port 10, exhaust ports 18 and 13, thus permitting the hammer to be elevated. lVhen the piston nears the limit of its upward movement cam 27 will engage cam 20 and move the valve 14 to connect valve port 17 with port 10 and bring exhaust port 18 into register with port 11, thereby permitting steam to flow to the cylinder above the piston for the driving stroke of the hammer.

It is obvious that the hammer and valve mechanism may be used for a variety of purposes and that it may be actuated by any fluid under pressure.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1- 1. A steam hammer comprising a frame, a cylinder rigidly supported in said frame, a piston in said cylinder, a depending piston rod connected to said piston, a hammer car ried by said piston rod at its lower end, means for guiding said hammer in the frame, a horizontally arranged slide valve carried by the cylinder, a valve rod carried by said valve and extending outwardly therefrom, a pair of upright arms carried by the hammer, a cam on each of said arms near its upper end, said cams being arranged to engage the projecting ends of the valve rod, one of said cams moving the valve in one direction and the other cam moving the valve in the opposite direction.

2. A power hammer comprising a frame, a power cylinder rigidly secured in the upper end of said frame, a piston in said cylinder, a downwardly extending piston rod connected to said piston, a hammer connected to the lower end of said piston rod, vertical ribs formed on said hammer and adapted to engage the frame to guide the hammer, a horizontally movable valve carried by the cylinder, a valve rod connected to said valve and extending outwardly therefrom, both ends of said valve rod projecting beyond the valve, upright standardssecured to the hammer on opposite sides thereof, each of said standards carrying a valve operating cam, said cams being at different heights, and one being arranged to force the valve in one direction as the hammer completes its upward movement, and 'the other being arranged to force the valve in the opposite direction when the hammer completes its downward movement, the valve in the cylinder being formed with suitable supply and exhaust ports.

3. A power hammer comprising a frame, a power cylinder rigidly secured in the upper end thereof, a piston in said cylinder, a depending piston rod connected to said piston, a hammer carried by said piston rod at its 'lower'end, vertical ribs formed on said hai'nmer at opposite sides thereof, said ribs being adapted to engage the movable frame and guide the hammer in its vertical move ment, a valve chest secured to the cylinder, a slide valve therein, a valve rod connected to said valve and extending outwardly from both ends of the valve, and means carried by the hammer and adapted to engage the valve rod at the ends of the hammer movements to move the valve and thereby admit fluid under pressure above the piston as the hammer moves upwardly and below the piston as the hammer moves downwardly.

4. The combination of a frame, a power cylinder rigidly secured in the upper end of said frame, a piston in said cylinder, a piston rod extending downwardly from said piston, a reciprocable head secured to the lower end of said piston rod, means to guide said head in the frame, a slide valve carried by the cylinder, a pair of upwardly extending cams carried by the head, a valve rod connected to the slide valve, both ends of said rod extending beyond the valve casing and adapted to be alternately engaged by the cams carried by the reciprocable head.

5. A power hammer comprising a frame, a power cylinder rigidly secured in said frame, a piston in said cylinder, a downwardly extending piston rod connected to said piston, a hammer connected to the lower end of said piston rod, means to guide the hammer in the frame, a horizontally movable valve carried by the cylinder,

said valve being provided with a central supply port and two exhaust ports, one on each side thereof, a valve seat formed on the cylinder, said seat being provided with two central supply ports and an exhaust port at each side of said supply ports, a valve chest inclosing the valve, avalve rod connected to said valve and extending outwardlv therefrom, a pair of cams carried by the hammer and adapted to engage the valve rod, said cams being at difierent heights, and one being arranged to force the valve in one direction as the hammer completes its upward movement, and the other being arranged to force the valve in the opposite direction as the hammer-completes its downward movement.

6. A power hammer comprising a frame, a power cylinder rigidly secured in said frame, a piston in said cylinder, a downwardly extending piston rod connected to said piston, a hammer connected to the lower end of said piston rod, means to guide the hammer in the frame, a horizontally movable valve carried by the cylinder, said valve being provided with a central supply port and two exhaust ports, one on each side thereof, a valve seat formed on the cylinder. said seat being provided with two central supply ports, and an exhaust port at each side of said supply ports, a valve chest inclosing the valve, a valve rod connected to said vaive, and extending outwardly there= from, both ends of said valve rod project ing beyond the valve chest, upright standards secured to the hammer on opposite sides thereof, each of said standards carrying a valve operating cam, said cams being at different heights, and one being arranged to force the valve in one direction as the hammer completes its upward movement 10 and the other being arranged to force the valve in the opposite direction when the hammer completes its dOWHWiIlU. movement.

In testimony whereof I hereunto afiix my signature in the presence of two Witnesses this 19th day of October 1909.

JAMES HAMILTON.

Witnesses:

W'n. R. DAVIS, E. H. H. KAUFMANN. 

